I see this super ego as the parent of the inner child, who is a composite of the ego and inner self. The inner child may now act as a bridge point between all selfs. But this is only only a speculation so far, it's obviously completely open to interpretation.
Maybe only in certain circumstances does it become fragmented and then necessary to understand before it can be melded back together.
Yes, I've come to understand that whenever i interact with someone, I am interacting first with their ego and secondly with what is pulling the strings of their ego - I also see glimpses of the true being sitting behind the ego, the words, thoughts, actions of their higherself. The danger however is and the trouble is, that the ego is the part of the person who wishes to engage your ego, and you on the ego level. It can act to try and bring you down into ego and keep you there where the person falsely believe they are most comfortable or in control. I can try and engage their higherself and encourage that aspect of them to interact more, but most peoples egos get in the way as the ego naturally feels threatened by the higherself. (Unless the person has actively done work to work on their ego and is open to the higher consciousness, has no blocks there etc)
It can be terribly frustrating if the ego constantly gets in the way and derails the deeper aspect and deeper meaning from surfacing. It's difficult living in a egocentric world, where the majority are driven by the desires and wants of the ego and pay little attention to the greater part of themselves...
So the challenge becomes in keeping that balance where your ego is not blocking your higher aspect/thinking/ actions or allowing other egos to trigger your ego because that is all they wish to engage in you. Ironically what i discovered in myself was the super ego taking the role of trying to protect me from other peoples egos triggering me. If anything becomes an 'ism' or a fear, because you fixate on it or fear 'what other other peoples ego will do to you ( in my case) then you can usually find an ego logic behind that ism.
In terms of the glass ceiling and ego in metaphysics, ego does create a glass ceiling, but more so as we still have to deal with multiple levels of consciousness and awareness and that relationship. The ego level of consciousness is our default day to day surviving mode of consciousness, but of course any being can switch in and out of consciousness levels like an elevator, in any given moment. Just that someone heavily in twinned in a egoic episode will not be able to surpass the ego level of consciousness for that period of time. That means their perceptions, actions, comprehension will all be of egoic value and level. Self reflection and self awareness would be the quickest jump start out of that level of being.
I think at some point personality has to be brought into the equation. Just because someone has little ego, does not mean they are void of a personality - And a persons higherself/ true self can have the biggest personality, just like someone in ego may have a big personality. Personality is not completely invented by the ego, but when the ego self is in check/ not dominating the show, the personality of the true self has room to show, grow and flourish. So i would say personality is something which exists without ego and is more soul related than ego related. Ie the person has real soul - meaning you can't miss it when you come across a personality that is truly is beaming and creating from their soul.